So obviously this thing draws more than .5a when charging Wondering if this thing would pull more than 1a off a different source.

So not sure what is going on but apparently my phone receives the same amount of juice from the wall as it does my battery pack.... and when plugged into my battery pack it says "AC" not "USB"

Is it still dying while using it when it's charging at .9 amps? It really shouldn't be, I can see it charging VERY slowly but the phone shouldn't be drawing more power than the charger can supply, unless the engineers were drunk as shit when they made the phone. Seems to be that your battery pack is working as intended at least, I seem to have a lot of problems with my chargers being confused from my phone as USB connections and only feeding me .5 amps, so I have to use the fast charge feature in a custom kernel to over ride it